How to make a 5 kg war bot for Robo sumo( part 1) .....

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 If you are want to make a 5 kg sumo robot for Robo war then you must have to follow some theory. I am telling you the right theory behind those bot's, and with out this theory you are not able to understand that how much power and torque will required to operate your bot. 1. Circumferential Velocity Calculation: If you are think that at first you chose the motor and then you will find wheels for your Bot, then my friend your idea is totally wrong. At first chose your  Bot's wheel then calculate the circumferential velocity. Now, usually in most of cases we are using 2 or 3 inch wheel for our 5 kg war bot. Consider 3 inch wheel and we will get the Circumference is 0.235 metre. Remember this one you have to convert those units in SI. And suppose consider your motor's RPM is 300. Now, Circumferential Velocity of your bot is Vs= (π * D *N)/60 ;        (π * D) is  Circumference of wheel                    ...
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Dark side of Lithium-ion Battery production

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 Yes,Lithium-ion batteries are main heart of the Future Automobile Industry. But are they good for environment?
No, 54% of Worlds Lithium reserves based on the Lithium Triangle in South America--border of Argentina,Bolivia and Chili. The production of a battery cell requires 20 different materials from around the world, which will pass through several refining stages,for those refining stages depending on different energy sources, and those energy sources all are not renewable. Another think is for several material purification process is not environment friendly.
  The average value of CO2 emission is around 177 kg CO2 / kwh power due to battery production. Suppose your car have a 30kwh battery pack that emits around 5.3 metric tonnes of CO2 . For more bigger battery like 100kwh it should emits around 17.7 metric tonnes of CO2 .    

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